PacketListRecord: add an ensureColorized() method and use it.

Don't call the columnString() and discard the result in order to force
colorization; instead, add a separate method to force colorization and
use that.

This avoids the need to choose a column; we were using 1 as the column
number, but column numbers are zero-origin, so that's column 2, which
isn't guaranteed to exist (a crash ensued if it didn't).

ui/qt/models/packet_list_model.cpp

@@ -760,7 +760,7 @@ void PacketListModel::ensureRowColorized(int row)
     if (!record)
         return;
     if (!record->colorized()) {
-        record->columnString(cap_file_, 1, true);
+        record->ensureColorized(cap_file_);
     }
 }
 

ui/qt/models/packet_list_record.cpp

@@ -46,6 +46,26 @@ PacketListRecord::~PacketListRecord()
     col_text_.clear();
 }
 
+void PacketListRecord::ensureColorized(capture_file *cap_file)
+{
+    // packet_list_store.c:packet_list_get_value
+    Q_ASSERT(fdata_);
+
+    if (!cap_file) {
+        return;
+    }
+
+    //
+    // XXX - do we need to check whether the data versions match?
+    // If the record's color is already correct, we shouldn't need
+    // to redissect it to colorize it.
+    //
+    bool dissect_color = !colorized_ || ( color_ver_ != rows_color_ver_ );
+    if (data_ver_ != col_data_ver_ || dissect_color) {
+        dissect(cap_file, dissect_color);
+    }
+}
+
 // We might want to return a const char * instead. This would keep us from
 // creating excessive QByteArrays, e.g. in PacketListModel::recordLessThan.
 const QString PacketListRecord::columnString(capture_file *cap_file, int column, bool colorized)
@@ -57,6 +77,11 @@ const QString PacketListRecord::columnString(capture_file *cap_file, int column,
         return QString();
     }
 
+    //
+    // XXX - do we still need to check the colorization, given that we now
+    // have the ensureColorized() method to ensure that the record is
+    // properly colorized?
+    //
     bool dissect_color = ( colorized && !colorized_ ) || ( color_ver_ != rows_color_ver_ );
     if (column >= col_text_.count() || col_text_.at(column).isNull() || data_ver_ != col_data_ver_ || dissect_color) {
         dissect(cap_file, dissect_color);

ui/qt/models/packet_list_record.h

@@ -32,6 +32,8 @@ public:
     PacketListRecord(frame_data *frameData);
     virtual ~PacketListRecord();
 
+    // Ensure that the record is colorized.
+    void ensureColorized(capture_file *cap_file);
     // Return the string value for a column. Data is cached if possible.
     const QString columnString(capture_file *cap_file, int column, bool colorized = false);
     frame_data *frameData() const { return fdata_; }